CU ATLAS Practical electronics Making NOISE with the 555 TIMER

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Presentation transcript:

CU ATLAS Practical electronics Making NOISE with the 555 TIMER Wayne Seltzer – Feb 27, 2016

Learning Objectives How can we create signals? Understand the Resistor/Capacitor (RC) circuit Build a tone generator with a 555 timer Optional: Solder the circuit on a perfboard

How can we create signals? Signal = value that changes over time What are other examples of signals?

Resistor/Capacitor (RC) Circuit Source: http://www.electronics-tutorials.ws/rc/rc_1.html Vc is the voltage across the capacitor Vs is the supply voltage t is the elapsed time since the application of the supply voltage RC is the time constant of the RC charging circuit

Neon bulb RC blinker (oscillator) 110 volts AC

555 timer astable oscillator + 5 volts 102 = 10 x 102 =1K 103 = 10 x 103 =10K 1K 10K 220 optional LED

Discussion Topics Change the capacitor and/or resistor values to change the frequency and duty cycle https://en.wikipedia.org/wiki/555_timer_IC http://houseofjeff.com/555-timer-oscillator-frequency-calculator/ http://www.ohmslawcalculator.com/555-astable-calculator Construct the 555 circuit by soldering the components on a perfboard Build a tone generator using an Arduino. What are the advantages/disadvantages vs. the 555 timer circuit?